Year	Percent
2001	59.10933
2002	57.90029
2003	61.23986
2004	58.0768
2005	60.32094
2006	60.27044
2007	59.14694
2008	59.89206
2009	60.76718
2010	61.05614
2011	59.17589
2012	59.02112
2013	60.24567
2014	61.5498
2015	60.22953
2016	57.02983
2017	56.55081